Hi,
a) 6s² = 6 * 5² = 6 * 25 = 150
b) πr² = π * 2.5² = pi * 6.25 ≈ 19.6
Rounded to one decimal place. Notice that we don't use the equal symbol here but the approximation one.
c) a² + b ² = 3² + 4² = 9 + 16 = 25
d) πr²h = π*2.3²*5.2 = π * 27.508 ≈ 86.4
Rounded to one decimal place.
e) (4/3) π r^3 = (4/3) π *1.5^3 = π * 4.5 ≈ 14.1
Rounded to one decimal place
f) x² - 2x - 24 = (-6)² - 2(-6) - 24 = 36 + 12 - 24 = 48 - 24 = 24